Enum value from display name

Question

I am new with C# and I have some troubles with enum.

I have Enum defined like this:

public enum CustomFields
{
    [Display(Name = "first_name")]
    FirstName = 1,

    [Display(Name = "last_name")]
    LastName = 2,
}

What I need is code which will check does display name exist and if so return enum value.

So if I have display name:

var name = "first_name";

I need something like:

var name = "first_name";
CustomFields.getEnumValue(name);

This should return:

CustomFields.FirstName;

Answer 1

You could use generics:

    public class Program
    {
        private static void Main(string[] args)
        {
            var name = "first_name";
            CustomFields customFields = name.GetValueFromName<CustomFields>();
        }
    }

    public enum CustomFields
    {
        [Display(Name = "first_name")]
        FirstName = 1,

        [Display(Name = "last_name")]
        LastName = 2,
    }


    public static T GetValueFromName<T>(this string name) where T : Enum
    {
        var type = typeof(T);

        foreach (var field in type.GetFields())
        {
            if (Attribute.GetCustomAttribute(field, typeof(DisplayAttribute)) is DisplayAttribute attribute)
            {
                if (attribute.Name == name)
                {
                    return (T)field.GetValue(null);
                }
            }

            if (field.Name == name)
            {
                return (T)field.GetValue(null);
            }
        }

        throw new ArgumentOutOfRangeException(nameof(name));
    }